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2006 Mercury Marquis A/C comes out defroster and heater ven

Tiny
LEEW54
  • MEMBER
  • 2006 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 40,000 MILES
Had the blender (blunder?) Changed under warranty last year. Recently stepped on gas hard to pass and a/c began to blow from heater and defroster only. In the old days that would happen when a vacuum line came loose. Any idea?
Saturday, June 19th, 2010 AT 4:03 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,139 POSTS
Same thing as the old days. THe vents are actuated by vacuum. When you hit the gas, the vacuum pressure drops in the engine. If there is a leak, what you described happens. Check under the dash as well as under the hood for leaks.

Let me know what you find.

Joe
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Monday, June 21st, 2010 AT 11:51 PM

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